Using a sample of 75 subjects, we found that the diameter of a coronary vessel has...

  

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Using a sample of 75 subjects, we found that the diameter of a coronary vessel has a mean of a = 2.75 mm and a standard deviation s = 0.45 mm. Assume that the diameter of this coronary vessel is normally distributed. (a) Give a 95% confidence interval for the average diameter of this coronary vessel. (b) Give the estimated standard error of the mean. (c) Using the sample mean as the population mean and the sample standard deviation as the population standard deviation, compute the probability that the diameter of a coronary vessel is less than 2 mm. Using a sample of 75 subjects, we found that the diameter of a coronary vessel has a mean of a = 2.75 mm and a standard deviation s = 0.45 mm. Assume that the diameter of this coronary vessel is normally distributed. (a) Give a 95% confidence interval for the average diameter of this coronary vessel. (b) Give the estimated standard error of the mean. (c) Using the sample mean as the population mean and the sample standard deviation as the population standard deviation, compute the probability that the diameter of a coronary vessel is less than 2 mm.